Virginia's Declaration of Rights was drawn upon by Thomas Jefferson for the opening paragraphs of the Declaration of Independence. It was widely copied by the other colonies and became the basis of the Bill of Rights.
The ridges found in flexible metal duct create turbulence and will diminish airflow. NEVER use 4 dryer duct or any plastic duct on a range hood installation. The minimum size duct allowed on most range hoods is 3 Â¼ by 10 which is equivalent to 6 round. More powerful hoods require even larger duct sizes up to 10 round. Consult the specifications for the model you have chosen.
do not use the damper supplied with the range hood. Use caulking to seal exterior wall or roof opening around the cap. The size of the vent should be uniform. Venting Methods Typical Internal Blower Motor System Venting Installations A 10 (25.4 cm) round vent system is needed for installation (not included). The range hood exhaust opening is 10 (25.4 cm) round. NOTE: Flexible vent is not recommended. Flexible vent creates back pressure